diff --git a/Cargo.toml b/Cargo.toml
index ceea4a7f..cea3bf8f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@ smallvec = "1.7"
 inferno = { version = "0.11", default-features = false, features = ["nameattr"], optional = true }
 prost = { version = "0.11", optional = true }
 prost-derive = { version = "0.11", optional = true }
-protobuf = { version = "3.0", optional = true }
+protobuf = { version = "2.0", optional = true }
 criterion = {version = "0.3", optional = true}
 
 [dependencies.symbolic-demangle]